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Diffstat (limited to 'lib/demapping/universal_ctrl_chans_demapper_impl.cc')
| -rw-r--r-- | lib/demapping/universal_ctrl_chans_demapper_impl.cc | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/lib/demapping/universal_ctrl_chans_demapper_impl.cc b/lib/demapping/universal_ctrl_chans_demapper_impl.cc new file mode 100644 index 0000000..ea9a06e --- /dev/null +++ b/lib/demapping/universal_ctrl_chans_demapper_impl.cc @@ -0,0 +1,135 @@ +/* -*- c++ -*- */ +/* + * Copyright 2014 <+YOU OR YOUR COMPANY+>. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * This software is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this software; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <gnuradio/io_signature.h> +#include "universal_ctrl_chans_demapper_impl.h" +#include <gsm/gsmtap.h> + +namespace gr { + namespace gsm { + + universal_ctrl_chans_demapper::sptr + universal_ctrl_chans_demapper::make(const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types) + { + return gnuradio::get_initial_sptr + (new universal_ctrl_chans_demapper_impl(starts_fn_mod51, channel_types)); + } + + /* + * The private constructor + */ + universal_ctrl_chans_demapper_impl::universal_ctrl_chans_demapper_impl(const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types) + : gr::block("universal_ctrl_chans_demapper", + gr::io_signature::make(0, 0, 0), + gr::io_signature::make(0, 0, 0)) + { + + d_timeslot=0; + for(int ii=0; ii<51; ii++) + { + d_starts_fn_mod51[ii]=0; + d_channel_types[ii]=0; + } + + std::vector<int>::const_iterator s; + std::vector<int>::const_iterator ch_type; + + for(s=starts_fn_mod51.begin(), ch_type=channel_types.begin();s != starts_fn_mod51.end(); s++) + { + if((*s > 0) and (*s < (51-4))) + { + for(int ii=0; ii<4; ii++){ + d_starts_fn_mod51[*s+ii] = *s; + if(ch_type!=channel_types.end()) + { + d_channel_types[*s+ii] = *ch_type; + } + } + if(ch_type!=channel_types.end()) + { + ch_type++; + } + } + } + + + message_port_register_in(pmt::mp("bursts")); + set_msg_handler(pmt::mp("bursts"), boost::bind(&universal_ctrl_chans_demapper_impl::filter_ctrl_chans, this, _1)); + message_port_register_out(pmt::mp("bursts")); + } + + /* + * Our virtual destructor. + */ + universal_ctrl_chans_demapper_impl::~universal_ctrl_chans_demapper_impl() + { + } + + void universal_ctrl_chans_demapper_impl::filter_ctrl_chans(pmt::pmt_t msg) + { + pmt::pmt_t header_blob = pmt::car(msg); + pmt::pmt_t content = pmt::cdr(msg); + gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_blob); + uint32_t frame_nr = be32toh(header->frame_number); + + uint32_t fn_mod51 = frame_nr % 51; + uint32_t fn51_start = d_starts_fn_mod51[fn_mod51]; + uint32_t fn51_stop = fn51_start + 3; + uint32_t ch_type = d_channel_types[fn_mod51]; + header->sub_type = ch_type; + + if(header->timeslot==d_timeslot){ + if(fn_mod51>=fn51_start && fn_mod51<=fn51_stop) + { + uint32_t ii = fn_mod51 - fn51_start; + d_frame_numbers[ii] = frame_nr; + d_bursts[ii] = msg; + } + + if(fn_mod51==fn51_stop) + { + //check for a situation where some bursts were lost + //in this situation frame numbers won't be consecutive + bool frames_are_consecutive = true; + for(int jj=1; jj<4; jj++) + { + if((d_frame_numbers[jj]-d_frame_numbers[jj-1])!=1) + { + frames_are_consecutive = false; + } + } + if(frames_are_consecutive) + { + //send bursts to the output + for(int jj=0; jj<4; jj++) + { + message_port_pub(pmt::mp("bursts"), d_bursts[jj]); + } + } + } + } + } + } /* namespace gsm */ +} /* namespace gr */ + |